Aircraft inertial navigation combination double-shaft self-calibration device

Abstract

The invention discloses an aircraft inertial navigation combination double-shaft self-calibration device, which comprises a pedestal, an outer frame shaft system and an automatic locking device mounted on the pedestal, an inner frame shaft system mounted on the outer frame shaft system, an aircraft inertial navigation combination connected to the inner frame shaft system, and infrared sensors for determining the rotation positions of the outer and inner frame shaft systems. The outer frame shaft system includes an outer frame, the two sides of which in the longitudinal direction are a sliding end and a locking end respectively. The inner frame shaft system includes inner frames arranged on two sides of the aircraft inertial navigation combination. The inner frames on the two sides are respectively provided with an inner frame shaft and an inner frame supporting rod that are respectively mounted on the lateral two sides of the outer frame by rolling bearings. The automatic locking device consists of a composite screw installed on the pedestal through angular contact bearings. The longitudinal two sides of the aircraft inertial navigation combination are equipped with a movable fluted disc and a push rod respectively. By means of automatic rotation of the inner and outer frame shaft systems, the device of the invention achieves self-calibration of the inertial navigation combination in the aircraft, and guarantees reliable strapdown between the aircraft inertial navigation combination and the aircraft through the automatic locking device.

Description

technical field [0001] The invention belongs to the field of inertial navigation, in particular to an aircraft inertial set dual-axis self-calibration device. Background technique [0002] An inertial navigation system usually consists of an inertial measurement device, a computer, a control display, etc. Among them, the inertial measurement device includes an accelerometer and a gyroscope, also known as an inertial navigation combination (abbreviated as an inertial group). The 3 degrees of freedom gyroscopes are used to measure the 3 rotational movements of the aircraft; the 3 accelerometers are used to measure the acceleration of the 3 translational movements of the aircraft. The strapdown inertial navigation system is simple in structure, small in size, and easy to maintain. It is directly installed on the aircraft through the inertial group to complete the guidance and navigation tasks. Therefore, the aircraft inertial set is the core of the aircraft control system and...

AI Technical Summary

Problems solved by technology

[0003] At present, the aircraft inertial group calibration process is complicated, and the aircraft inertial group needs to be disassembled, and the calibration test is performed on a third-party special test equipment.

The testing process is complex and requires manual intervention

However, the existing single-axis and dual-axis calibration devices for land and marine inertial units have limited environmental adaptability and cannot be used on aircraft.

[0004] Judging from the published information, most of the single-axis or dual-axis modulation devices for land and marine inertial sets are limited to theoretical research, and these devices mainly have the following limitations, which restrict their application on aircraft

First, single-axis modulation devices often cannot complete the calibration of all parameters of the inertial group solely relying on the degrees of freedom of their own shaft system

Second, the existing single-axis or dual-axis modulation devices have relatively low requirements for locking and releasing reliability, and the degree of automation is not high

Third, in this type of device, especially in the dual-axis rotary device, the slip ring method is often used for wiring, and there is relative sliding between the slideway and the contact point, and the reliability of the inertial group cannot be guaranteed in the shock and vibration environment during the flight of the aircraft. Work

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